Magneto rotor



Oct. 11, 1938. c 2,133,083

- 'MAGNETO ROTOR Filed Sept. 21, 1956 //J van for,

Patented Oct. 11, 1938 UNITED STATES PATENT OFFICE 16 Claims.

This invention relates to magnetos having r0- tating magnets.

The main objects of this invention are to pro- 'vide an improved form of magneto rotor; to provide improved magnetic laminae for bridging the like poles of the magnets; to provide improved means for binding the laminae to the magnets so as to prevent them from being moved outwardly by centrifugal force during the rotation of the rotorito provide a rotor of this kind wherein the magnets are of the U-type; and to provide improved means for rotatably supporting a plurality of U-shaped magnets.

An illustrative embodiment of this invention is shown in the accompanying drawing, wherein:

Fig. 1 is an axial section of the improved rotor; the central magnet and the drive shaft being shown in elevation.

Fig. 2 is a side elevation of the rotor.

Figs. 3, 4 and 5 are transverse sections taken respectively on the lines 33, 44 and 5-5 of Fig. 1.

Inasmuch as this invention relates particularly to the rotor, the other parts of the magneto have been omitted from the drawing.

In the form shown, the improved rotor comprises a drive shaft I and three U-shaped permanent magnets 2 which are carried by the drive shaft and which are arranged side by side in sub N stantially parallel spaced relation to one another.

The central magnet is larger than the other two and its closed end intersects the axis of the drive shaft. In order to properly balance the rotor, the magnets are relatively arranged so as to be equi-distant from the axis of the drive shaft.

The closed ends of the magnets are clamped together and to the drive shaft by an improved clamp comprising interfitting jaws 3 and 4. The jaw 3 is provided with a socket 5 for receiving the reduced inner end 6 of the drive shaft. Keys 1 drivingly secure the drive shaft and jaw 3 together so that the assembled rotor elements will be rotated as a unit. Formed in the opposite edges of the jaw 3 are notches 8 forming seats for the legs of the magnets. The forward end of the jaw 3 is tapered to providea bearing 9 which abuts the inner portions of the closed ends of the magnets. With this improved construction, there is a three point contact between the jaw 3 and each magnet. The jaw 3 has a pair of fianges l0 provided with tenons II which fit into mortises I2 of flanges l3 formed on the jaw 4. The flanges l0 and I3 are also secured together by rivets I 4, by which arrangement the jaws 3 and h 4 are maintained in accurate alignment.

The jaw 4 has a base part I5 which is provided with three notches l6 for receiving the outer edges of the closed ends of the magnets. This base part [5 is also provided with a hub I! having a journal l8 in axial alinement with the drive shaft l. Fixed on the hub I1, is a gear IQ for driving the magneto distributor, not shown.

The outer end of the drive shaft is tapered as shown at 20 and threaded as shown at 2| for engagement with the usual impulse coupling, not shown.

Mounted on the drive shaft, is a pair of spacer plates 22 and 23, which are apertured to receive the legs of the magnets. These spacer plates are spaced apart axially and are secured against shifting axially of the drive shaft by means of annular springs 24 seated in grooves 25 of the shaft.

Located between the spacer plates 22 and 23, are two sets of magnetizable laminae which respectively bridge the like poles of the U-shaped magnets. These laminae consist of alternately arranged stampings 26 and 21 having openings 28 and 29, respectively, for receiving the legs of the magnets. In order to prevent magnetic short circuiting. these stampings are slit as shown at .30 and 3|.

If the laminae are not firmly bound to the magnets, they will be thrown outwardly during the rotation of the rotor and, inasmuch as there is usually an air gap of only .005 inch between the laminae and the stationary pole pieces, the laminae will be thrown into contact with the pole pieces. To prevent such contact, the laminae of this improved rotor are firmly bound to the magnets by dowel rods 32, which extend through apertures 33 and 34 in the stampings 26 and 21, respectively. The apertures 33 of the stampings 26 are carefully aligned with respect to the apertures 34 of the stampings 21 so that, when the dowel rods are driven through the apertures, certain portions of the stampings will contract and firmly grip the magnets.

A rotor of this improved construction is highly efiicient and can be very quickly assembled.

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that certain details of the construction shown may be altered or omitted without departing from the spirit of the invention as defined by the following claims.

I claim:

1. A magneto rotor comprising a drive shaft, a U-shaped magnet having its closed end intersecting the axis of said shaft, a clamp mounted on said drive shaft and embracing said closed end of the magnet, said clamp having a magnet receiving opening therethrough and embodying a member positioned in the inner portion of said closed end and a member extending beyond said end, and a member mounted on said drive shaft and supporting the open end of said magnet.

2. A magneto 'rotor comprising a plurality of U-ehaped permanent magnets, a clamp embracing the closed ends of said magnets, a spacer connected to the open ends of said magnets, and a pair of axially alined journals on said clamp and spacer respectively.

3. A magneto rotor comprising a plurality of U-shaped permanent magnets arranged side by 1 side in substantially parallel spaced relation, a non-magnetic clamp embracing the closed ends of said magnets, a non-magnetic spacer arranged to support the open ends of said magnets, and a pair of axially alined journals on said clamp and spacer respectively.

4. .A magneto rotor comprising a drive shaft, a plurality of U-shaped permanent magnets disposed side by side in substantially parallel spaced relation, the closed end of one of said magnets intersecting the axis of said drive shaft, a clamp on saiddrive shaft embracing the closed ends of said magnets, a journal on said clamp in axial alinement with said shaft, and a spacer mounted on said shaft and supporting the open ends of said magnets.

5. A magneto rotor comprising a drive shaft, a plurality of U-shaped permanent magnets disposed side by sidein substantially parallel spaced relation, the closed end of one of said magnets intersecting the axis of said drive shaft, a clamp on said drive shaft embracing the closed ends of said magnets, a journal on said clamp in axial alinement with said shaft, a plurality of magnetic laminae bridging the like poles of the open ends of said magnets, and a spacer mounted on said shaft and supporting the open ends of said magnets.

6. A magneto rotor comprising a drive shaft, a plurality of U-shaped permanent magnets disposed in substantially parallel spaced relation, a non-magnetic clamp embracing the closed ends of said magnets, a journal on said clamp in axial alinement with. said shaft, two sets of magnetic laminae bridging respectively the like poles of the open ends of said magnets, and a pair of spacer plates mounted on said shaft on respectively opposite ends of said laminae for supporting the open ends of said magnets.

7. A magneto rotor comprising a plurality or permanent magnets arranged in substantially parallel spaced relation and each having a closed and an open end, means for supporting the open ends of the magnets, a drive shaft between the magnet poles, a clamp engaging said shaft and embracing the closed ends of the magnets having a flanged member positioned in the inner portions of said closed ends and a flanged member extending beyond said ends, means for securing said flanged members together, a plurality of magnetic laminae bridging the like poles respectively of said magnets and having openings for receiving said magnets, said laminae having apertures therein, the apertures of certain of said laminae being aligned, with respect to the apertures of other-laminae, and dowel rods extending through said apertures for binding said laminae to said magnets. w

8. A magneto rotor comprising a plurality of permanent magnets arranged in substantially parallel spaced relation and each having a closed and an open end, means for supporting the open ends of the magnets, a drive shaft between the magnet poles, a clamp engaging said shaft and embracing the closed ends of the magnets having a flanged member positioned in the inner portions of said closed ends and a flanged member extending beyond said ends, means for securing said flanged members together, a plurality of magnetic laminae bridging the like poles respectively of said magnets and having openings for receiving said magnets, portions of said laminae being slit adjacent said openings to prevent magnetic short circuiting around the poles, said laminae having apertures therein, the apertures of certain of said laminae being aligned, with respect to the apertures of other laminae, and dowel rods extending through said apertures for binding said laminae to said magnets.

9. In a magneto rotor, a magnet and shaft engaging device having an opening therethrough for the installation and retention of a magnet, said device including a base member having a flange extending therefrom, a shaft engaging member extending from said base member having a flange engageable with the flange on the base member, and means for securing said flanges together.

10. In a magneto rotor, a permanent magnet having a closed end and an open end; means for supporting the open end of the magnet; a drive shaft extending into the open end of the magnet; a clamping device engaging said shaft and embracing the closed end of the magnet having a flanged member positioned in the inner portion of said end and a member extending from the outer portion of said closed end embodying flanges engageable with the flanges on said first mentioned member, and means for securing said flanges together.

11. In a magnetorotor, a permanent magnet having a closed end and an open end, a spacer supporting the open end of the magnet, a drive shaft extending through the spacer and terminating a distance from the inner portion of the closed end, and a clamp embracing the closed end having a jaw positioned in the inner portion of said closed end and engaging said shaft and a jaw extending from the outer portion of said closed end.

12. In a magneto rotor, 'a clamping and engaging device for a drive shaft and a plurality of U-shaped magnets having closed ends and legs extending therefrom, comprising a combined base member and a shaft engaging member having openings therebetween forming seats for closed ends of magnets, said shaft engaging member being formed to provide contact points for the inner portions of magnets.

13. In a magneto rotor, a permanent magnet having a closed end and an open end, means for supporting the open end of the magnet, a clamp embracing the closed end of the magnet and having a socket therein, and a drive shaft extending through the supporting means and secured in the socket;

14. In a magneto rotor, a permanent magnet having a closed end and an open end, means for supportingthe open end of the magnet, a clamp embracing the closed end of the magnet and contacting inner portions thereof, a drive shaft extending through the supporting means,

and means for securing the shaft to the clamp.

15. A magneto rotor comprising oppositely disposed U-shaped permanent magnets each composed of a single piece of material and embodying a closed end and an open end, a spacer engaging the free ends of the magnets, laminations mounted on the magnet legs, means for securing the legs, laminations and spacer together, a clamping device in which the closed ends of the magnets are seated and with which portions of the magnets contact, said magnets, laminations, spacer and clamp comprising a unitary structure, and a shaft insertible between the magnets and extending through the spacer and drivingly connected to the clamp, said clamp and shaft rotating said unitary structure.

16. In a magneto rotor a permanent magnet having a closed end and an open end, opposed clamping jaws engaging the closed end of said magnet and supporting the magnet for rotation, a shaft section fixed with one of the clamping jaws and a second shaft section fixed with the other jaw, interfitting means on the jaws arranged to insure a predetermined relation of the clamping jaws and alignment of said shaft sections when said jaws are fitted together about the closed end of said magnet, and means for securing the jaws together.

HENRY G. COX. 

